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1.发明公开公开(公告)号：US20230321631A1
公开(公告)日：2023-10-12
申请号：US18027041
申请日：2021-08-27
申请人： Rare Earth Functional Materials (Xiong 'an) Innovation Center Co., Ltd. , GRIREM ADVANCED MATERIALS CO., LTD , GRIREM HI-TECH CO., LTD.
发明人： Yongqi ZHANG , Zheng ZHAO , Xiaowei HUANG , Yongke HOU , Meisheng CUI , Zhizhe ZHAI , Zongyu FENG , Juanyu YANG , Yang XU
CPC分类号： B01J21/066 , B01J23/10 , B01J37/038 , B01J37/009 , B01J37/08
摘要： The present disclosure provides a cerium-zirconium-based composite oxide with a core-shell structure and a preparation method thereof, a catalyst system using the cerium-zirconium-based composite oxide, a catalytic converter for purifying tail gas by using the catalyst system, and application of the catalyst system or the catalytic converter in motor vehicle exhaust purification, industrial waste gas treatment or catalytic combustion. In the present invention, the cerium-zirconium-based composite oxide with a core-shell structure oxygen storage material is prepared by a step-by-step precipitation method. On the one hand, yttrium and a part of zirconium and cerium are precipitated on a cerium-zirconium surface, where the post-precipitation of yttrium is to segregate yttrium ions (Y3+) on a grain boundary surface, thus reducing lattice surface energy, pinning the grain boundary surface, making the migration of the grain boundary surface difficult, controlling the growth of grains.
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2.发明公开公开(公告)号：US20240359164A1
公开(公告)日：2024-10-31
申请号：US18770265
申请日：2024-07-11
申请人： GRIREM HI-TECH CO., LTD. , Rare Earth Functional Materials (Xiong 'an) Innovation Center Co., Ltd. , GRIREM ADVANCED MATERIALS CO., LTD.
发明人： Zheng ZHAO , Xiaowei HUANG , Yongqi ZHANG , Yongke HOU , Zongyu FENG , Weixin ZHAO , Yang XU
IPC分类号： B01J23/656 , B01J35/57 , B01J37/02 , B01J37/08 , B01J37/12
CPC分类号： B01J23/6562 , B01J35/57 , B01J37/0215 , B01J37/08 , B01J37/12
摘要： Disclosed are a grain boundary and surface-loaded noble metal catalyst, a preparation method and an application thereof. The noble metal is dispersed at the grain boundary and surface of alumina and/or a rare earth manganese-zirconium composite oxide to form a multiphase interface, which achieves the following beneficial technical effects: firstly, the multiphase interface has a larger steric hindrance and a stronger anchoring effect, which can inhibit the migration, agglomeration, and growth of the noble metal at high temperatures, increase the high-temperature stability and catalytic performance of the noble metal, and reduce the usage of the noble metal; secondly, the multiphase interface exhibits a synergistic catalytic effect, which can reduce the activation energy of lattice oxygen and increase the quantity of active oxygen, thereby enhancing the NO oxidation and low-temperature catalytic activity.
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3.发明公开公开(公告)号：US20230321632A1
公开(公告)日：2023-10-12
申请号：US18027044
申请日：2021-08-27
申请人： GRIREM ADVANCED MATERIALS CO., LTD. , RARE EARTH FUNCTIONAL MATERIALS (XIONG 'AN) INNOVATION CENTER CO., LTD. , GRIREM HI-TECH CO., LTD.
发明人： Xiaowei HUANG , Yongke HOU , Zheng ZHAO , Yongqi ZHANG , Juanyu YANG , Meisheng CUI , Zhizhe ZHAI , Yang XU , Zongyu FENG , Shilei CHEN
CPC分类号： B01J21/066 , B01J35/1014 , B01J37/009 , B01J37/038 , B01J23/10 , B01J35/1038 , B01J35/1042 , B01D53/945 , B01J37/08 , B01D2255/407 , B01D2258/01 , B01D2255/908
摘要： The present disclosure relates to a cerium-zirconium-based composite oxide having gradient element distribution and a preparation method therefor. According to the present disclosure, the cerium-zirconium-based composite oxide having gradient element distribution is prepared by a step-by-step precipitation method. First, a zirconium-rich component is precipitated to form a crystal structure and a crystal grain stack structure which have high thermal stability, slow down the segregation of zirconium on a surface after high-temperature treatment, and reduce element migration among crystal grains; second, a cerium-rich component is precipitated to improve the cerium content of the surface layers of the crystal grains, improve the utilization rate of the cerium element, and improve the oxygen storage amount and the oxygen storage rate.
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公开(公告)号：US20220184583A1
公开(公告)日：2022-06-16
申请号：US17422691
申请日：2020-09-04
申请人： GRIREM ADVANCED MATERIALS CO.,LTD. , Rare Earth Functional Materials (Xiong'an) Innovation Center Co., Ltd. , GRIREM HI-TECH CO.,LTD.
发明人： Xiaowei HUANG , Yongqi ZHANG , Hongwei LI , Zhizhe ZHAI , Qiang ZHONG , He ZHANG , Meisheng CUI , Yongke HOU , Hao WANG , Zongyu FENG
摘要： The present invention discloses a rare-earth-manganese/cerium-zirconium-based composite compound, a method for preparing the same, and a use thereof. The composite compound is of a core-shell structure with a general formula expressed as: A REcBaOb-(1-A)CexZr(1-x-y)MyO2-z, wherein 0.1≤A≤0.3, preferably 0.1≤A≤0.2; a shell layer has a main component of rare-earth manganese oxide with a general formula of REcMnaOb, wherein RE is a rare-earth element or a combination of more than one rare-earth elements, and B is Mn or a combination of Mn and a transition metal element, 1≤a≤8, 2≤b≤18, and 0.25≤c≤4; and a core has a main component of cerium-zirconium composite oxide with a general formula of CexZr(1-x-y)MyO2-z, wherein M is one or more non-cerium rare-earth elements, 0.1≤x≤0.9, 0≤y≤0.3, and 0.01≤z≤0.3. The composite compound enhances an oxygen storage capacity of a cerium-zirconium material through an interface effect, thereby increasing a conversion rate of a nitrogen oxide.
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公开(公告)号：US20210310100A1
公开(公告)日：2021-10-07
申请号：US17267481
申请日：2019-08-09
发明人： Xiaowei HUANG , Zongyu FENG , Xu SUN , Yang XU , Meng WANG , Liangshi WANG , Chao XIA , Xiangsheng LIU , Longsheng ZHAO , Yongqi ZHANG
摘要： The present invention provides a process for metallurgy and separating a rare earth concentrate using a combination method, the process including: treating the rare earth concentrate containing bastnaesite by using a method including roasting under an atmosphere, leaching with hydrochloric acids, and roasting with a sulfuric acid, wherein stepping acid leaching with low-concentration hydrochloric acids is controlled during the leaching with the hydrochloric acids so as to obtain a rare earth solution with a high concentration (150-250 g/L REO), such that a leaching rate of Ce reaches 60% or more, and the content of F− in a leaching liquor is reduced by aging; and rare earth is further recovered from a leach residue by roasting with the sulfuric acid and leaching with water, and the total yield of the rare earth reaches 95% or more.
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